53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
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/*
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* Support KVM gust page tracking
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*
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* This feature allows us to track page access in guest. Currently, only
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* write access is tracked.
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*
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* Copyright(C) 2015 Intel Corporation.
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*
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* Author:
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* Xiao Guangrong <guangrong.xiao@linux.intel.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include <linux/kvm_host.h>
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#include <asm/kvm_host.h>
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#include <asm/kvm_page_track.h>
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#include "mmu.h"
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void kvm_page_track_free_memslot(struct kvm_memory_slot *free,
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struct kvm_memory_slot *dont)
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{
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int i;
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for (i = 0; i < KVM_PAGE_TRACK_MAX; i++)
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if (!dont || free->arch.gfn_track[i] !=
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dont->arch.gfn_track[i]) {
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kvfree(free->arch.gfn_track[i]);
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free->arch.gfn_track[i] = NULL;
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}
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}
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int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
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unsigned long npages)
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{
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int i;
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for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) {
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slot->arch.gfn_track[i] = kvm_kvzalloc(npages *
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sizeof(*slot->arch.gfn_track[i]));
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if (!slot->arch.gfn_track[i])
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goto track_free;
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}
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return 0;
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track_free:
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kvm_page_track_free_memslot(slot, NULL);
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return -ENOMEM;
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}
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